JP6057978B2 - Automatic transmission oil deterioration judgment device - Google Patents

Automatic transmission oil deterioration judgment device Download PDF

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JP6057978B2
JP6057978B2 JP2014253225A JP2014253225A JP6057978B2 JP 6057978 B2 JP6057978 B2 JP 6057978B2 JP 2014253225 A JP2014253225 A JP 2014253225A JP 2014253225 A JP2014253225 A JP 2014253225A JP 6057978 B2 JP6057978 B2 JP 6057978B2
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automatic transmission
oil
deterioration
oil temperature
threshold value
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JP2016114471A (en
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山下　徹
徹 山下
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0405—Monitoring quality of lubricant or hydraulic fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2888—Lubricating oil characteristics, e.g. deterioration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/30—Oils, i.e. hydrocarbon liquids for lubricating properties

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Description

この発明は自動変速機油の劣化判定装置に関する。   The present invention relates to an automatic transmission oil deterioration determination device.

自動変速機油（Automatic Transmission Fluid。トランスミッションオイル）の劣化を判定する技術としては、例えば特許文献１記載の技術が知られている。   As a technique for determining the deterioration of automatic transmission fluid (transmission oil), for example, a technique described in Patent Document 1 is known.

特許文献１記載の技術にあっては、車両の走行に応じて発生して自動変速機油の劣化を進め得る多様な劣化要因に関連した複数の劣化要素を取得することで車両の使われ方をモニタリングし、取得された複数の劣化要素に基づいて算出されたオイル劣化推定値に従って当該車両に搭載された変速機の自動変速機油の使用態様の厳しさの度合いを判定し、それに応じて自動変速機油の交換タイミングを決定して通知するように構成している。   In the technique described in Patent Document 1, how a vehicle is used by acquiring a plurality of deterioration factors related to various deterioration factors that are generated in accordance with traveling of the vehicle and can promote deterioration of an automatic transmission oil. Monitoring and determining the degree of severity of usage of the automatic transmission oil of the transmission mounted on the vehicle according to the estimated oil deterioration value calculated based on the plurality of acquired deterioration factors, and automatic shifting is accordingly performed The machine oil replacement timing is determined and notified.

特開２０１１−２１４９３２号公報JP 2011-214932 A

このように特許文献１記載の技術にあっては、車両の走行に応じて発生して自動変速機油の劣化を進め得る多様な劣化要因に関連した複数の劣化要素を取得することで自動変速機油の劣化を判定するため、構成が複雑となっていた。   As described above, in the technique described in Patent Document 1, the automatic transmission fluid is obtained by acquiring a plurality of deterioration factors related to various deterioration factors that are generated in accordance with the traveling of the vehicle and can promote the deterioration of the automatic transmission fluid. Therefore, the configuration is complicated.

従って、この発明の目的は上記した不都合を解消し、簡易な構成でありながら、変速機ケース内に回転自在に支持される自動変速機の作動・潤滑用の自動変速機油の劣化を精度良く判定するようにした自動変速機油の劣化判定装置を提供することにある。   Therefore, the object of the present invention is to eliminate the above-mentioned inconveniences and accurately determine deterioration of automatic transmission oil for operation and lubrication of the automatic transmission that is rotatably supported in the transmission case, while having a simple configuration. An object of the present invention is to provide an automatic transmission oil deterioration judging device.

上記した課題を解決するために、請求項１にあっては、車両に搭載されて駆動源の回転を変速して駆動輪に伝達すると共に、変速機ケース内に回転自在に支持される自動変速機の作動・潤滑用の自動変速機油の劣化判定装置において、前記自動変速機油の油温を検出する油温検出手段と、前記油温検出手段によって検出された油温の上昇率を算出する油温上昇率算出手段と、前記車両の走行状態に基づいて前記自動変速機油の消泡性能の低下を推定させる閾値を算出する閾値算出手段と、所定の条件が成立したと判断されるとき、前記算出された油温上昇率を閾値と比較し、前記算出された油温上昇率が閾値以上のとき、前記自動変速機油が劣化したと判定する劣化判定手段と、前記劣化判定手段によって前記自動変速機油が劣化したと判定されるとき、ユーザに前記自動変速機油の交換を促す交換督促手段とを備える如く構成した。   In order to solve the above-described problem, according to a first aspect of the present invention, an automatic transmission that is mounted on a vehicle, shifts the rotation of a drive source and transmits it to a drive wheel, and is rotatably supported in a transmission case. In an automatic transmission oil deterioration judging device for machine operation and lubrication, oil temperature detecting means for detecting the oil temperature of the automatic transmission oil, and oil for calculating an increase rate of the oil temperature detected by the oil temperature detecting means When it is determined that a predetermined condition is satisfied, a temperature increase rate calculating means, a threshold calculating means for calculating a threshold for estimating a decrease in the defoaming performance of the automatic transmission oil based on a running state of the vehicle, The calculated oil temperature increase rate is compared with a threshold value, and when the calculated oil temperature increase rate is equal to or greater than the threshold value, a deterioration determining means for determining that the automatic transmission oil has deteriorated, and the automatic shift by the deterioration determining means. Judged that machine oil has deteriorated The time was as constituting and a replacement demand means for prompting the replacement of the user automatic transmission fluid.

請求項２に係る自動変速機油の劣化判定装置にあっては、前記劣化判定手段は、前記検出された自動変速機油の油温が所定温度以上で、かつ前記自動変速機の回転要素の回転数が閾値以上の状態が既定時間以上継続したとき、前記所定の条件が成立したと判断する如く構成した。   In the automatic transmission oil deterioration determination device according to claim 2, the deterioration determination means is configured such that the detected oil temperature of the automatic transmission oil is equal to or higher than a predetermined temperature, and the rotation speed of the rotation element of the automatic transmission is determined. Is configured so that it is determined that the predetermined condition is satisfied when a state where the value is equal to or greater than the threshold value continues for a predetermined time or longer.

請求項３に係る自動変速機油の劣化判定装置にあっては、前記閾値算出手段は、前記車両の走行速度と変速比とに基づいて前記閾値を算出する如く構成した。   In the automatic transmission oil deterioration determining apparatus according to a third aspect, the threshold value calculation means is configured to calculate the threshold value based on a traveling speed and a gear ratio of the vehicle.

請求項１に係る自動変速機油の劣化判定装置にあっては、自動変速機油の油温を検出し、検出された油温の上昇率を算出し、車両の走行状態に基づいて自動変速機油の消泡性能の低下を推定させる閾値を算出し、所定の条件が成立したと判断されるとき、算出された油温上昇率を閾値と比較し、算出された油温上昇率が閾値以上のとき、自動変速機油が劣化したと判定すると共に、自動変速機油が劣化したと判定されるとき、ユーザに自動変速機油の交換を促す如く構成したので、簡易な構成でありながら自動変速機油の劣化を精度良く判定することができる。   In the automatic transmission oil deterioration judging device according to claim 1, the oil temperature of the automatic transmission oil is detected, the rate of increase of the detected oil temperature is calculated, and the automatic transmission oil is detected based on the running state of the vehicle. When a threshold value for estimating a decrease in defoaming performance is calculated and it is determined that a predetermined condition is satisfied, the calculated oil temperature increase rate is compared with the threshold value, and the calculated oil temperature increase rate is equal to or greater than the threshold value Since it is determined that the automatic transmission fluid has deteriorated and the automatic transmission fluid has been determined to have deteriorated, the user is prompted to replace the automatic transmission fluid. It can be determined with high accuracy.

即ち、油温の上昇率が大きくなると、自動変速機油の消泡性能が悪化して自動変速機油が劣化するという知見に基づき、車両の走行状態に基づいて消泡性能の低下（換言すれば自動変速機油の劣化）を推定させる閾値を算出し、所定の条件が成立したと判断されるとき、算出された油温の上昇率と比較して劣化を判定するようにしたので、自動変速機の劣化を簡易に判定することができる。また、多様な劣化要因に関連した複数の劣化要素を取得する工数が不要となるので、装置のコストを低くすることができる。また、ユーザも遅滞なく自動変速機を交換することができる。   That is, based on the knowledge that the defoaming performance of the automatic transmission fluid deteriorates and the automatic transmission fluid deteriorates as the rate of increase in the oil temperature increases, the defoaming performance decreases (in other words, automatic (Deterioration of transmission oil) is calculated, and when it is determined that the predetermined condition is satisfied, the deterioration is determined by comparing with the calculated rate of increase in the oil temperature. Deterioration can be easily determined. In addition, since the man-hours for acquiring a plurality of deterioration factors related to various deterioration factors are not required, the cost of the apparatus can be reduced. Also, the user can replace the automatic transmission without delay.

請求項２に係る自動変速機油の劣化判定装置にあっては、検出された自動変速機油の油温が所定温度以上で、かつ自動変速機の回転要素の回転数（要素回転数）が閾値以上の状態が既定時間以上継続したとき、所定の条件が成立したと判断する如く構成したので、自動変速機の劣化を精度良く判定することができる。   In the automatic transmission oil deterioration determination device according to claim 2, the detected oil temperature of the automatic transmission oil is equal to or higher than a predetermined temperature, and the rotation speed (element rotation speed) of the rotation element of the automatic transmission is equal to or higher than a threshold value. Since the configuration is such that it is determined that the predetermined condition is satisfied when the state continues for a predetermined time or more, the deterioration of the automatic transmission can be accurately determined.

即ち、油温の上昇率から劣化を判定するに際し、劣化が進行すると、変速機ケース内の自動変速機油の動油面（自動変速機の動作中の泡立つ油面）が高くなるという知見に基づき、油温と回転数と継続時間とから動油面が高くなる状況を所定の条件、換言すれば劣化判定が可能な状況と見做し、そのときに油温の上昇率と閾値とを比較して劣化を判定するようにしたので、劣化を精度良く判定することができる。   That is, when judging the deterioration from the rate of increase in the oil temperature, if the deterioration progresses, the dynamic oil level of the automatic transmission oil in the transmission case (the oil level that bubbles during operation of the automatic transmission) increases. The situation in which the oil level rises from the oil temperature, the number of revolutions and the duration is considered to be a predetermined condition, in other words, a situation where deterioration can be judged, and at that time, the rate of increase in oil temperature is compared with a threshold value. Therefore, the deterioration can be determined with high accuracy.

請求項３に係る自動変速機油の劣化判定装置にあっては、車両の走行速度と変速比とに基づいて閾値を算出する如く構成したので、閾値の算出に車両の走行状況を反映させることができ、よって自動変速機油の劣化を一層精度良く判定することができる。   In the automatic transmission oil deterioration determination device according to the third aspect of the present invention, the threshold value is calculated based on the traveling speed and the gear ratio of the vehicle. Therefore, the traveling condition of the vehicle can be reflected in the calculation of the threshold value. Therefore, the deterioration of the automatic transmission oil can be determined with higher accuracy.

この発明の実施形態に係る自動変速機油の劣化判定装置を全体的に示す概略図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an overall automatic transmission oil deterioration determination device according to an embodiment of the present invention. 図１に示す装置の動作を説明するフロー・チャートである。It is a flowchart explaining operation | movement of the apparatus shown in FIG. 図２の劣化判断特定モードにあるか否かの判断処理を示すサブ・ルーチン・フロー・チャートである。FIG. 3 is a sub-routine flow chart showing processing for determining whether or not the deterioration determination specific mode of FIG. 2 is in effect. FIG. 図３の要素回転数の算出で使用される特性の説明図である。It is explanatory drawing of the characteristic used by calculation of the element rotation speed of FIG. 同様に、図３の要素回転数の算出で使用される特性の説明図である。Similarly, it is explanatory drawing of the characteristic used by calculation of the element rotation speed of FIG. 図２の油温の上昇率の算出処理を示すサブ・ルーチン・フロー・チャートである。FIG. 3 is a sub-routine flow chart showing a process for calculating an oil temperature increase rate in FIG. 2. FIG. 図２の閾値の算出処理を示すサブ・ルーチン・フロー・チャートである。FIG. 3 is a sub-routine flow chart showing threshold value calculation processing of FIG. 2. FIG. 図７の閾値の算出で使用される閾値の特性の説明図である。It is explanatory drawing of the characteristic of the threshold value used by calculation of the threshold value of FIG. 図１に示す自動変速機油の走行距離に対する消泡性能の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the defoaming performance with respect to the travel distance of the automatic transmission oil shown in FIG. 図９に示す消泡性能に対する油温の上昇率の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the raise rate of the oil temperature with respect to the defoaming performance shown in FIG. 図１に示す自動変速機油の劣化に対する動油面の特性を示す説明図である。It is explanatory drawing which shows the characteristic of the dynamic oil surface with respect to deterioration of the automatic transmission oil shown in FIG. 図１の自動変速機の要素回転数に対する自動変速機油のフリクションの特性を示す説明図である。FIG. 2 is an explanatory diagram showing friction characteristics of automatic transmission oil with respect to element rotational speed of the automatic transmission of FIG. 1. 図３の要素回転数の算出で使用される特性の変形例を示す説明図である。It is explanatory drawing which shows the modification of the characteristic used by calculation of the element rotation speed of FIG.

以下、添付図面に即してこの発明に係る自動変速機油の劣化判定装置を実施するための形態について説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment for carrying out an automatic transmission oil deterioration determination device according to the present invention will be described with reference to the accompanying drawings.

（実施形態）
図１はこの発明の実施形態に係る自動変速機油の劣化判定装置を全体的に示す概略図である。 (Embodiment)
FIG. 1 is a schematic diagram showing an overall automatic transmission oil deterioration determining apparatus according to an embodiment of the present invention.

図１において符号１０は自動変速機（以下、単に「変速機」という）を示す。変速機１０は車両（図示せず）に搭載され、駆動源、より具体的には内燃機関（以下「エンジン」という。図１で図示せず）の出力を変速して左右の駆動輪（図示せず）に伝達する。   In FIG. 1, reference numeral 10 denotes an automatic transmission (hereinafter simply referred to as “transmission”). The transmission 10 is mounted on a vehicle (not shown) and shifts the output of a drive source, more specifically, an internal combustion engine (hereinafter referred to as “engine”; not shown in FIG. 1) to drive left and right drive wheels (see FIG. (Not shown).

図示の如く、変速機１０は、互いに平行に設けられた入力軸（回転軸）１２とＤＲ（ドライブ）プーリ軸（回転軸）１４とＤＮ（ドリブン）プーリ軸（回転軸）１６とアイドル軸１８を備え、エンジンの出力はロックアップクラッチ２０ａを有するトルクコンバータ２０を介して入力軸１２から入力される。   As shown in the figure, the transmission 10 includes an input shaft (rotary shaft) 12, a DR (drive) pulley shaft (rotary shaft) 14, a DN (driven) pulley shaft (rotary shaft) 16, and an idle shaft 18 provided in parallel with each other. The output of the engine is input from the input shaft 12 via the torque converter 20 having the lock-up clutch 20a.

ＤＲプーリ軸１４とＤＮプーリ軸１６の間には、無段変速機構（Continuously Variable Transmission。以下「ＣＶＴ機構」という）２６が設けられる。   A continuously variable transmission mechanism (hereinafter referred to as “CVT mechanism”) 26 is provided between the DR pulley shaft 14 and the DN pulley shaft 16.

ＣＶＴ機構２６は、ＤＲプーリ軸１４に配設されたＤＲプーリ３０とＤＮプーリ軸１６に配設されたＤＮプーリ３２と、その間に巻き掛けられた無端可撓性部材（例えば金属製のＶベルト）３４からなる。   The CVT mechanism 26 includes a DR pulley 30 disposed on the DR pulley shaft 14, a DN pulley 32 disposed on the DN pulley shaft 16, and an endless flexible member (for example, a metal V belt) ) 34.

ＤＲプーリ３０は、ＤＲプーリ軸１４に相対回転不能で軸方向移動不能に設けられた固定ＤＲプーリ半体３０ａと、ＤＲプーリ軸１４に相対回転不能で固定ＤＲプーリ半体３０ａに対して軸方向移動自在に設けられた可動ＤＲプーリ半体３０ｂからなる。   The DR pulley 30 is fixed to the DR pulley shaft 14 so as not to rotate relative to the DR pulley shaft 14 and cannot move in the axial direction. The DR pulley 30 cannot move relative to the DR pulley shaft 14 and axially relative to the fixed DR pulley half 30a. The movable DR pulley half 30b is movably provided.

ＤＮプーリ３２は、ＤＮプーリ軸１６に相対回転不能で軸方向移動不能に設けられた固定ＤＮプーリ半体３２ａと、ＤＮプーリ軸１６に相対回転不能で固定ＤＮプーリ半体３２ａに対して軸方向移動自在に設けられた可動ＤＮプーリ半体３２ｂからなる。   The DN pulley 32 is fixed to the DN pulley shaft 16 so as not to rotate relative to the DN pulley shaft 16 and cannot move in the axial direction. The DN pulley 32 cannot move relative to the DN pulley shaft 16 and axially relative to the stationary DN pulley half 32a. The movable DN pulley half 32b is provided so as to be movable.

可動ＤＲプーリ半体３０ｂと可動ＤＮプーリ半体３２ｂにはピストン室（油圧作動室）３０ｂ１，３２ｂ１が設けられ、可動ＤＲ，ＤＮプーリ半体３０ｂ，３２ｂはピストン室３０ｂ１，３２ｂ１に供給された作動油の油圧（側圧）に応じて固定ＤＲ，ＤＮプーリ半体３０ａ，３２ａに接近あるいは離間する。   The movable DR pulley half 30b and the movable DN pulley half 32b are provided with piston chambers (hydraulic working chambers) 30b1 and 32b1, and the movable DR and DN pulley halves 30b and 32b are supplied to the piston chambers 30b1 and 32b1. The fixed DR and DN pulley halves 30a and 32a approach or separate from each other according to the oil pressure (side pressure).

入力軸１２上には車両の進行方向を切り換える前後進切換機構３６が設けられる。前後進切換機構３６は前進（ＦＷＤ）走行ギア３８と前進（ＦＷＤ）クラッチ４０、および後進（ＲＶＳ）走行ギア４２と後進（ＲＶＳ）クラッチ４４からなる。   A forward / reverse switching mechanism 36 that switches the traveling direction of the vehicle is provided on the input shaft 12. The forward / reverse switching mechanism 36 includes a forward (FWD) travel gear 38 and a forward (FWD) clutch 40, and a reverse (RVS) travel gear 42 and a reverse (RVS) clutch 44.

入力軸１２からトルクコンバータ２０を介して入力されるエンジンの出力は、前進走行ギア３８または後進走行ギア４２を介してＤＲプーリ軸１４に伝えられ、ＤＲプーリ軸１４を車両前進方向または後進方向に回転させる。   The engine output input from the input shaft 12 via the torque converter 20 is transmitted to the DR pulley shaft 14 via the forward travel gear 38 or the reverse travel gear 42, and the DR pulley shaft 14 is moved forward or backward in the vehicle. Rotate.

ＤＮプーリ軸１６にはディファレンシャル機構４６が接続される。ディファレンシャル機構４６には左右の車軸４８が固定されると共に、その端部には駆動輪（図示せず）が取り付けられる。   A differential mechanism 46 is connected to the DN pulley shaft 16. The left and right axles 48 are fixed to the differential mechanism 46, and driving wheels (not shown) are attached to the ends thereof.

ＣＶＴ機構２６にあっては、ＤＲプーリ３０とＤＮプーリ３２の両プーリ側圧を増減させてプーリ幅を変化させ、無端可撓性部材３４の両プーリ３０，３２に対する巻き掛け半径を変化させて巻き掛け半径の比（プーリ比）に応じた所望の変速比（レシオ）を無段階で得ることができる。   In the CVT mechanism 26, the pulley side pressure of both the DR pulley 30 and the DN pulley 32 is increased / decreased to change the pulley width, and the winding radius of the endless flexible member 34 to both the pulleys 30, 32 is changed to perform winding. A desired gear ratio (ratio) corresponding to the ratio of the multiplying radii (pulley ratio) can be obtained steplessly.

図示の如く、変速機１０はケース５０に収容される。より具体的には、ケース５０は、変速機１０などの本体部分を収容するミッションケース（変速機ケース）５２と、トルクコンバータ２０などを収容するトルコンケース５４とからなる。   As illustrated, the transmission 10 is housed in a case 50. More specifically, the case 50 includes a transmission case (transmission case) 52 that houses a main body portion such as the transmission 10 and a torque converter case 54 that houses the torque converter 20 and the like.

また、変速機ケース５２内部にはエンジンによって駆動される油圧（オイル）ポンプ５６が設けられ、下部のオイルパン（リザーバ）から汲み上げたＡＴＦ（自動変速機油）６０をＤＲ，ＤＮプーリ３０，３２のピストン室３０ｂ１，３２ｂ１に圧送する。   In addition, a hydraulic (oil) pump 56 driven by the engine is provided inside the transmission case 52, and the ATF (automatic transmission fluid) 60 pumped from the lower oil pan (reservoir) is supplied to the DR and DN pulleys 30 and 32. Pumped to the piston chambers 30b1 and 32b1.

ＤＲ，ＤＮプーリ軸１４，１６は中空形状を呈し、ＤＲ，ＤＮプーリ軸１４，１６内部の軸方向にそれぞれ各ピストン室３０ｂ１，３２ｂ１と連通する油路１４ａ，１６ａが形成されると共に、変速機ケース５２の壁内にも油路５２ａが形成され、油圧ポンプ５６がオイルパンより汲み上げたＡＴＦ６０は、変速機ケース５２の油路５２ａ及びＤＲ，ＤＮプーリ軸１４，１６の油路１４ａ，１６ａを介してＤＲ，ＤＮプーリ３０，３２のピストン室３０ｂ１，３２ｂ１に圧送（供給）されると共に、図示しない油圧制御バルブや前進、後進クラッチ４０，４４のピストン室などにも圧送される。   The DR and DN pulley shafts 14 and 16 have a hollow shape, and oil passages 14a and 16a communicating with the respective piston chambers 30b1 and 32b1 are formed in the axial direction inside the DR and DN pulley shafts 14 and 16, respectively. An oil passage 52a is also formed in the wall of the case 52, and the ATF 60 pumped up from the oil pan by the hydraulic pump 56 passes through the oil passage 52a of the transmission case 52 and the oil passages 14a and 16a of the DR and DN pulley shafts 14 and 16. The pressure is fed (supplied) to the piston chambers 30b1 and 32b1 of the DR and DN pulleys 30 and 32, and is also pressure-fed to a hydraulic control valve (not shown) and the piston chambers of the forward and reverse clutches 40 and 44.

車両の適宜位置にはＥＣＵ（Electronic Control Unit。電子制御ユニット）６２が設けられる。   An ECU (Electronic Control Unit) 62 is provided at an appropriate position of the vehicle.

変速機ケース５２の下部のオイルパンの付近に油温センサ６４が設けられてＡＴＦ６０の油温を示す信号を出力すると共に、車軸４８の付近には回転数センサ６６が設けられ、車軸４８の所定の回転角度ごとにパルス信号を出力する。   An oil temperature sensor 64 is provided in the vicinity of the oil pan below the transmission case 52 to output a signal indicating the oil temperature of the ATF 60, and a rotation speed sensor 66 is provided in the vicinity of the axle 48, so A pulse signal is output at each rotation angle.

油温センサ６４と回転数センサ６６の出力はＥＣＵ６２に送られる。ＥＣＵ６２は回転数センサ６６の出力信号の時間間隔を測定して車速（車両の走行速度）を検出する。   Outputs of the oil temperature sensor 64 and the rotation speed sensor 66 are sent to the ECU 62. The ECU 62 detects the vehicle speed (vehicle traveling speed) by measuring the time interval of the output signal of the rotation speed sensor 66.

図示は省略するが、上記した油温センサ６４と回転数センサ６６以外にも多くのセンサが設けられ、それらセンサの出力もＥＣＵ６２に送られる。さらに、ＥＣＵ６２はエンジンの動作を制御するエンジンＥＣＵ（図示せず）とも通信自在に構成され、エンジンＥＣＵを通じてエンジン回転数など多くのエンジン運転パラメータを取得する。   Although illustration is omitted, many sensors are provided in addition to the oil temperature sensor 64 and the rotational speed sensor 66 described above, and outputs of these sensors are also sent to the ECU 62. Further, the ECU 62 is configured to be able to communicate with an engine ECU (not shown) that controls the operation of the engine, and acquires many engine operation parameters such as the engine speed through the engine ECU.

ＥＣＵ６２は、入力されたセンサ出力とエンジンＥＣＵを通じて取得したエンジン運転パラメータとに基づき、上記したトルクコンバータ２０のロックアップクラッチ２０ａの係合量、ＤＲプーリ３０などのプーリ幅、前進クラッチ４０あるいは後進クラッチ４４の係合・非係合などを、それらの背圧室やピストン室などに供給される油圧を調整することで制御する。   The ECU 62 determines the engagement amount of the lockup clutch 20a of the torque converter 20 described above, the width of the pulley such as the DR pulley 30, the forward clutch 40 or the reverse clutch based on the input sensor output and the engine operating parameter acquired through the engine ECU. The engagement / disengagement of 44 is controlled by adjusting the hydraulic pressure supplied to the back pressure chamber, the piston chamber, and the like.

さらに、ＥＣＵ６２は、ＡＴＦ６０の劣化を判定する。以下、ＥＣＵ６２のＡＴＦ６０の劣化判定動作（処理）について説明する。   Further, the ECU 62 determines the deterioration of the ATF 60. Hereinafter, the deterioration determination operation (process) of the ATF 60 of the ECU 62 will be described.

図２はその動作を説明するフロー・チャートである。   FIG. 2 is a flowchart for explaining the operation.

先ずＳ１０において劣化判断特定モードにあるか否か判断する（Ｓ：処理ステップ）。劣化判断特定モードは、ＡＴＦ６０の劣化判定を可能とする（許可する）モード所定の条件が成立したことを意味する。   First, in S10, it is determined whether or not the deterioration determination specific mode is set (S: processing step). The deterioration determination specific mode means that a predetermined condition for enabling (permitting) deterioration determination of the ATF 60 is satisfied.

図３は劣化判断特定モードにあるか否かの判断処理を示すサブ・ルーチン・フロー・チャートである。   FIG. 3 is a sub-routine flow chart showing a determination process of whether or not the deterioration determination specific mode is set.

最初にＳ１００において回転数センサ６６によって検出された車速と、ＣＶＴ機構２６で設定されている現在の変速比（レシオ）と、油温センサ６４によって検出されたＡＴＦ６０の油温とを取得する（読み込む）。   First, the vehicle speed detected by the rotation speed sensor 66 in S100, the current gear ratio (ratio) set by the CVT mechanism 26, and the oil temperature of the ATF 60 detected by the oil temperature sensor 64 are acquired (read). ).

次いでＳ１０２に進み、検出された油温が所定温度以上か否か判断し、否定されるときはＳ１０４に進み、通常モードにあり、劣化判断特定モードにはないと判断する。   Next, the process proceeds to S102, in which it is determined whether or not the detected oil temperature is equal to or higher than a predetermined temperature. If the determination is negative, the process proceeds to S104, where it is determined that the normal mode is set and the deterioration determination specific mode is not set.

一方、Ｓ１０２で肯定されるときはＳ１０６に進み、車速と変速比とから所定の特性を検索して要素回転数を算出する。   On the other hand, when the result in S102 is affirmative, the program proceeds to S106, in which a predetermined characteristic is searched from the vehicle speed and the gear ratio to calculate the element rotational speed.

図４と図５はその特性を説明する説明図である。図４と図５において、要素回転数は変速機１０の種々の要素（部位）の回転数、具体的にはＣＶＴ機構２６のＤＲプーリ３０とＤＮプーリ３２とディファレンシャル機構（「デフ」と図示）４６（より詳しくはそのリングギア）を意味する。   4 and 5 are explanatory diagrams for explaining the characteristics. 4 and 5, the element rotational speed is the rotational speed of various elements (parts) of the transmission 10, specifically, the DR pulley 30, the DN pulley 32, and the differential mechanism (shown as “differential”) of the CVT mechanism 26. 46 (more specifically, the ring gear).

図４はＣＶＴ機構２６の変速比（レシオ）がＬＯＷ端にあるとき、図５はそれがＯＤ端にあるときの特性である。変速比がＬＯＷ端にあるときは要素１がＤＲプーリ３０、要素２がＤＮプーリ３２となり、ＯＤ端にあるときはその逆となる。   FIG. 4 shows the characteristics when the gear ratio (ratio) of the CVT mechanism 26 is at the LOW end, and FIG. 5 shows the characteristics when it is at the OD end. When the gear ratio is at the LOW end, element 1 is the DR pulley 30, and element 2 is the DN pulley 32, and vice versa when at the OD end.

Ｓ１０６では回転数センサ６６から検出される車速（横軸）と、その時点で設定されているＣＶＴ機構２６の変速比に基づき、変速比がＬＯＷ端あるいはＯＤ端にあるときは図４あるいは図５の特性に従って要素回転数を算出する一方、変速比がその間にあるときは、破線で示す如く、図４と図５の特性の間に設定される特性に従って要素回転数を算出する。より具体的には、要素１，２，３の３種の特性との交点を求め、それらの交点に対応する縦軸の値を読み取ることで、要素回転数を算出する。   In S106, based on the vehicle speed (horizontal axis) detected from the rotation speed sensor 66 and the gear ratio of the CVT mechanism 26 set at that time, when the gear ratio is at the LOW end or the OD end, FIG. 4 or FIG. On the other hand, when the gear ratio is between them, the element speed is calculated according to the characteristic set between the characteristics shown in FIGS. More specifically, the number of rotations of the element is calculated by obtaining intersections with the three characteristics of the elements 1, 2, and 3 and reading the values on the vertical axis corresponding to these intersections.

このように、この実施形態に係る劣化判定では要素回転数なる概念を導入すると共に、Ｓ１０６の処理ではその要素回転数を算出する。これについては後述する。   As described above, the concept of the element rotational speed is introduced in the deterioration determination according to this embodiment, and the element rotational speed is calculated in the process of S106. This will be described later.

図３フロー・チャートにあっては次いでＳ１０８に進み、算出された要素回転数（変速機１０の回転要素（ＣＶＴ機構２６のＤＲプーリ３０とＤＮプーリ３２とディファレンシャル機構４６）の回転数）が閾値（図４と図５に示す）以上か否か判断し、否定されるときはＳ１０４に進む一方、肯定されるときはＳ１１０に進み、Ｓ１０２で検出された自動変速機油の油温が所定温度以上と判断されると共に、Ｓ１０８で要素回転数が閾値以上と判断された状態の継続時間を計測する。   In the flowchart of FIG. 3, the process then proceeds to S108, where the calculated element rotational speed (the rotational speed of the rotational element of the transmission 10 (the rotational speed of the DR pulley 30, the DN pulley 32, and the differential mechanism 46 of the CVT mechanism 26)) is the threshold value. (If it is negative, the process proceeds to S104. If the determination is positive, the process proceeds to S110, and the oil temperature of the automatic transmission oil detected in S102 is equal to or higher than a predetermined temperature.) And the duration of the state in which the element rotational speed is determined to be greater than or equal to the threshold in S108 is measured.

次いでＳ１１２に進み、Ｓ１１０で計測された継続時間が適宜設定する既定時間以上か否か判断し、否定されるときはＳ１０４に進む一方、肯定されるときはＳ１１４に進み、劣化判断特定モードにあると判断（判定）する。   Next, the process proceeds to S112, in which it is determined whether or not the duration time measured in S110 is equal to or longer than a predetermined time to be set as appropriate. When the determination is negative, the process proceeds to S104. Judge (determine).

このように、Ｓ１０２で検出された自動変速機油の油温が所定温度以上と判断され、かつＳ１０８で要素回転数が閾値以上と判断され、Ｓ１１２でその状態が適宜設定する既定時間以上継続したと判断されるとき、劣化判断特定モードにあると判定、換言すれば所定の条件が成立したと判断する。   As described above, it is determined that the oil temperature of the automatic transmission fluid detected in S102 is equal to or higher than a predetermined temperature, and in S108, it is determined that the element rotational speed is equal to or higher than the threshold value. When the determination is made, it is determined that the deterioration determination specific mode is in effect, that is, it is determined that a predetermined condition is satisfied.

その結果、図２フロー・チャートにおいては、Ｓ１０の判断は肯定されてＳ１２に進み、油温の上昇率を算出する。   As a result, in the flowchart of FIG. 2, the determination in S10 is affirmed and the process proceeds to S12, and the rate of increase in the oil temperature is calculated.

図６はその処理を示すサブ・ルーチン・フロー・チャートである。   FIG. 6 is a sub-routine flowchart showing the processing.

以下説明すると、Ｓ２００において油温センサ６４によって検出されたＡＴＦ６０の油温を再び取得し（読み込み）、Ｓ２０２に進み、前回値（例えば１ｍｉｎから５ｍｉｎ前の値）との差分値（あるいは微分値）を求めて油温の上昇率を算出し、Ｓ２０４に進み、算出した値を次回の演算用に前回値として記憶する。   Explaining below, the oil temperature of the ATF 60 detected by the oil temperature sensor 64 in S200 is acquired (read) again, and the process proceeds to S202, where the difference value (or differential value) from the previous value (for example, a value from 1 min to 5 min before). The oil temperature increase rate is calculated, and the process proceeds to S204, where the calculated value is stored as the previous value for the next calculation.

図２フロー・チャートに戻ると、次いでＳ１４に進み、油温の上昇率を比較するための閾値（消泡性能の低下を推定させる閾値）を算出する。   Returning to the flowchart of FIG. 2, the process then proceeds to S <b> 14 to calculate a threshold value (threshold value for estimating a decrease in the defoaming performance) for comparing the rate of increase in the oil temperature.

図７はその処理を示すサブ・ルーチン・フロー・チャートである。   FIG. 7 is a sub-routine flowchart showing the processing.

以下説明すると、Ｓ３００において車速と変速比（レシオ）を再び取得し（読み込み）、Ｓ３０２に進み、取得された車速と変速比から図８に示す特性を検索して閾値を算出する。   In the following, the vehicle speed and the gear ratio (ratio) are acquired (read) again in S300, and the process proceeds to S302, where the characteristics shown in FIG. 8 are searched from the acquired vehicle speed and gear ratio to calculate the threshold value.

図８に示す如く、閾値は変速比ごとに設定されると共に、車速が増加するほど増加するように設定される。これは、車速が増加するほど、変速機ケース５２においてＡＴＦ６０の攪拌度合いが増加してフリクションが増加し、よって消泡性能が低下したと推定されるからである。同図に記載される上下３本の線は、下から上に向かうにつれて変速比が高くなるように設定される。   As shown in FIG. 8, the threshold value is set for each gear ratio, and is set to increase as the vehicle speed increases. This is because it is estimated that as the vehicle speed increases, the degree of agitation of the ATF 60 increases in the transmission case 52 and the friction increases, thereby deteriorating the defoaming performance. The upper and lower three lines shown in the figure are set so that the gear ratio increases from the bottom to the top.

図２フロー・チャートに戻ると、次いでＳ１６に進み、Ｓ１２で算出された油温の上昇率がＳ１４で算出された閾値以上か否か判断し、否定されるときは以降の処理をスキップする一方、肯定されるときはＳ１８に進み、ＡＴＦ６０が劣化したと判定し、ＡＴＦ交換警告灯を点灯してユーザにＡＴＦ６０の交換を促す。   Returning to the flow chart of FIG. 2, the process then proceeds to S16, where it is determined whether or not the rate of increase in the oil temperature calculated in S12 is equal to or greater than the threshold value calculated in S14. If the result is affirmative, the process proceeds to S18, where it is determined that the ATF 60 has deteriorated, and the ATF replacement warning lamp is turned on to prompt the user to replace the ATF 60.

尚、Ｓ１８においてはＡＴＦ交換警告灯の点灯に代え、オーディオ装置を利用した音声あるいはナビゲーション装置の画面を利用した映像（さらには音声と映像）などで交換を促すように構成しても良い。   In S18, instead of turning on the ATF replacement warning lamp, the replacement may be urged by voice using the audio device or video (or voice and video) using the screen of the navigation device.

上記した劣化判定について図９以降を参照して説明すると、図９に示す如く、走行距離が増加するにつれてＡＴＦ６０の消泡性能が悪化し、図１０に示す如く、それに伴ってＡＴＦ６０の油温の上昇率が増加することは、良く知見されるところである。   9 will be described with reference to FIG. 9 and subsequent figures. As shown in FIG. 9, the defoaming performance of the ATF 60 deteriorates as the mileage increases. As shown in FIG. It is well known that the rate of increase increases.

しかしながら、ＡＦＴ６０の油温の上昇率を単純に閾値と比較するだけでは劣化と即断することはできない。   However, it is not possible to immediately determine deterioration by simply comparing the increase rate of the oil temperature of the AFT 60 with a threshold value.

そこで、発明者はさらに知見を重ねた結果、車両の走行状態に基づいて消泡性能の低下（換言すればＡＴＦ６０の劣化）を推定させるに足る閾値を算出し、所定の条件の成立を判断することで劣化判定の可否を判断し、劣化判定が可能と判断されるとき、算出された油温の上昇率と比較するように構成すれば、ＡＴＦ６０の劣化を精度良く判定できることを見出してこの発明をなしたものである。   Therefore, as a result of further insight, the inventor calculates a threshold value sufficient to estimate a decrease in defoaming performance (in other words, deterioration of ATF 60) based on the running state of the vehicle, and determines whether a predetermined condition is satisfied. The present invention finds that the deterioration of the ATF 60 can be determined with high accuracy if it is configured to compare with the calculated rate of increase in the oil temperature when it is determined whether the deterioration determination is possible. It was made.

より詳しくは、ＡＴＦ６０の劣化が進むと、図１１に示す如く、動油面（変速機ケース５２内の変速機１０の動作中のＡＴＦ６０の泡立ち油面）が高くなるという知見に基づき、動油面そのものは直接把握できないため、それに代え、図１２に示すように要素回転数という概念を導入し、それが高くなる状態では攪拌抵抗が増加すると予想されることから、その要素回転数をトリガとして劣化の判定が可能か否か判断するようにした。   More specifically, as the deterioration of the ATF 60 progresses, as shown in FIG. 11, the dynamic oil surface (the bubbling oil surface of the ATF 60 during the operation of the transmission 10 in the transmission case 52) increases. Since the surface itself cannot be grasped directly, instead of introducing the concept of element rotation speed as shown in FIG. 12, it is expected that the stirring resistance will increase when it becomes high, so that element rotation speed is used as a trigger. Judgment was made as to whether or not deterioration could be determined.

即ち、油温が比較的高く、算出される要素回転数が閾値以上となる状態が適宜設定する既定時間以上継続するような状況を劣化判定が可能とする劣化判断特定モードとし、そのモードにあるとき、ＡＴＦ６０の劣化を判定するようにした。これによってＡＴＦ６０の劣化を精度良く判定することができる。   In other words, the deterioration determination specific mode in which deterioration determination is possible is a state in which the oil temperature is relatively high and the state where the calculated element rotational speed is equal to or greater than a threshold value continues for a predetermined time or more, and is in that mode. At this time, the deterioration of the ATF 60 was determined. This makes it possible to accurately determine the deterioration of the ATF 60.

尚、上記において、要素回転数の算出用に図４と図５に示す特性を例示したが、特性はそれらに限られるものではなく、要素を例えばＡＴＦ６０の攪拌（掻き上げ）度合い（換言すればＡＴＦ６０のフリクション）が大きいディファレンシャル機構４６（より詳しくはそのリングギア）とし、図１３に示す如く、要素１は、ＣＶＴ機構２６の変速比（レシオ）が小さいとき（ＬＯＷ）の、要素２は中位のプーリ比が１のときの、要素３は大きいとき（ＯＤ）のディファレンシャル機構４６の回転数を意味するように設定しても良い。   In the above, the characteristics shown in FIG. 4 and FIG. 5 are illustrated for calculating the element rotational speed. However, the characteristics are not limited to these, and the elements are, for example, the degree of stirring (scraping) of ATF 60 (in other words, The differential mechanism 46 (more specifically, its ring gear) has a large friction of the ATF 60, and as shown in FIG. 13, the element 1 has a medium transmission ratio (ratio) of the CVT mechanism 26 (LOW) and the element 2 has a medium When the pulley ratio is 1, the element 3 may be set to mean the rotational speed of the differential mechanism 46 when it is large (OD).

上記した如く、この実施形態にあっては、車両に搭載されて駆動源（エンジン）の回転を変速して駆動輪に伝達すると共に、変速機ケース５２内に回転自在に支持される自動変速機１０の作動・潤滑用の自動変速機油（ＡＴＦ）６０の劣化判定装置において、前記自動変速機油の油温を検出する油温検出手段（油温センサ６４，ＥＣＵ６２，Ｓ１２，Ｓ２００）と、前記油温検出手段によって検出された油温の上昇率を算出する油温上昇率算出手段（ＥＣＵ６２，Ｓ１２，Ｓ２０２）と、前記車両の走行状態に基づいて前記自動変速機油の消泡性能の低下を推定させる閾値を算出する閾値算出手段（ＥＣＵ６２，Ｓ１４，Ｓ３００，Ｓ３０２）と、所定の条件が成立したと判断されるとき（Ｓ１００，Ｓ１０２，Ｓ１０６からＳ１１４）、前記算出された油温上昇率を閾値と比較し、前記算出された油温上昇率が閾値以上のとき、前記自動変速機油が劣化したと判定する劣化判定手段（ＥＣＵ６２，Ｓ１６，Ｓ１８）と、前記劣化判定手段によって前記自動変速機油が劣化したと判定されるとき、ユーザに前記自動変速機油の交換を促す交換督促手段（ＥＣＵ６２，Ｓ１８）とを備える如く構成したので、簡易な構成でありながらＡＴＦ（自動変速機油）６０の劣化を精度良く判定することができる。   As described above, in this embodiment, an automatic transmission that is mounted on a vehicle, shifts the rotation of a drive source (engine), transmits the rotation to drive wheels, and is rotatably supported in a transmission case 52. 10, an oil temperature detection means (oil temperature sensor 64, ECU 62, S 12, S 200) for detecting the oil temperature of the automatic transmission oil, and the oil An oil temperature increase rate calculating means (ECU 62, S12, S202) for calculating an increase rate of the oil temperature detected by the temperature detecting means, and a decrease in the defoaming performance of the automatic transmission oil is estimated based on the running state of the vehicle. Threshold calculation means (ECU 62, S14, S300, S302) for calculating the threshold to be used, and when it is determined that a predetermined condition is satisfied (S100, S102, S106 to S114) Degradation determining means (ECU 62, S16, S18) for comparing the calculated oil temperature increase rate with a threshold value and determining that the automatic transmission oil has deteriorated when the calculated oil temperature increase rate is equal to or greater than the threshold value; When the deterioration determining means determines that the automatic transmission oil has deteriorated, the ATF is provided with an exchange prompting means (ECU 62, S18) that prompts the user to replace the automatic transmission oil. (Automatic transmission oil) The deterioration of 60 can be accurately determined.

即ち、油温の上昇率が大きくなると、ＡＴＦ６０の消泡性能が悪化して劣化するという知見に基づき、車両の走行状態に基づいて消泡性能の低下を推定させる閾値を算出し、所定の条件が成立したと判断されるとき、算出された油温の上昇率と比較して劣化を判定するようにしたので、自動変速機油の劣化を簡易に判定することができる。また、多様な劣化要因に関連した複数の劣化要素を取得する工数が不要となるので、装置のコストを低くすることができる。また、これによってユーザも遅滞なくＡＴＦ６０を交換することができる。   That is, based on the knowledge that the defoaming performance of the ATF 60 deteriorates and deteriorates when the rate of increase in the oil temperature increases, a threshold value for estimating a decrease in the defoaming performance based on the running state of the vehicle is calculated. When it is determined that is satisfied, the deterioration is determined by comparing with the calculated rate of increase in the oil temperature, so that it is possible to easily determine the deterioration of the automatic transmission oil. In addition, since the man-hours for acquiring a plurality of deterioration factors related to various deterioration factors are not required, the cost of the apparatus can be reduced. This also allows the user to exchange the ATF 60 without delay.

また、前記劣化判定手段は、前記検出された自動変速機油の油温が所定温度以上で、かつ前記自動変速機の回転要素の回転数（要素回転数）が閾値以上の状態が既定時間以上継続したとき、前記所定の条件が成立したと判断する（ＥＣＵ６２，Ｓ１０，Ｓ１０２，Ｓ１０６からＳ１１４）如く構成したので、自動変速機油の劣化を精度良く判定することができる。   Further, the deterioration determining means continues a state in which the detected oil temperature of the automatic transmission oil is equal to or higher than a predetermined temperature and the rotation speed (element rotation speed) of the rotation element of the automatic transmission is equal to or greater than a predetermined time. In this case, since it is determined that the predetermined condition is satisfied (ECU 62, S10, S102, S106 to S114), it is possible to accurately determine the deterioration of the automatic transmission oil.

即ち、油温の上昇率から劣化を判定するに際し、劣化が進行すると、変速機ケース５２の動油面が高くなるという知見に基づき、油温と回転数と継続時間とから動油面が高くなる状況を所定の条件、換言すれば劣化判定が可能となる状況と見做し、そのときに油温の上昇率と閾値とを比較して劣化を判定するようにしたので、自動変速機油の劣化を精度良く判定することができる。   That is, when determining deterioration from the rate of increase in the oil temperature, based on the knowledge that as the deterioration progresses, the moving oil surface of the transmission case 52 becomes higher, the moving oil surface becomes higher from the oil temperature, the rotational speed, and the duration. Therefore, the deterioration is judged by comparing the rate of increase in the oil temperature with a threshold value. Degradation can be accurately determined.

また、前記閾値算出手段は、前記車両の走行速度と変速比とに基づいて前記閾値を算出する（ＥＣＵ６２，Ｓ１４，Ｓ３００，Ｓ３０２）如く構成したので、自動変速機油（ＡＴＦ）６０の消泡性能の低下を推定させる閾値の算出に車両の走行状況を反映させることができ、よって自動変速機油（ＡＴＦ）６０の劣化を一層精度良く判定することができる。   Further, since the threshold value calculation means is configured to calculate the threshold value based on the traveling speed and speed ratio of the vehicle (ECU 62, S14, S300, S302), the defoaming performance of the automatic transmission fluid (ATF) 60 It is possible to reflect the traveling state of the vehicle in the calculation of the threshold value for estimating the decrease in the engine speed, and therefore it is possible to determine the deterioration of the automatic transmission fluid (ATF) 60 with higher accuracy.

尚、上記において自動変速機として無段変速機（ＣＶＴ）を開示したが、それに止まるものではなく、自動変速機は有段変速機でもよく、あるいはツインクラッチ型の変速機であっても良い。   In the above description, a continuously variable transmission (CVT) is disclosed as an automatic transmission. However, the automatic transmission is not limited to this, and the automatic transmission may be a stepped transmission or a twin clutch type transmission.

１０ 自動変速機、１２ 入力軸（回転軸）、１４ ＤＲプーリ軸（回転軸）、１４ａ油路、１６ ＤＮプーリ軸（回転軸）、１６ａ 油路、２０ トルクコンバータ、２６ ＣＶＴ機構、３０ ＤＲプーリ、３０ｂ１ ピストン室（油圧作動室）、３２ ＤＮプーリ、３２ｂ１ ピストン室（油圧作動室）、３６ 前後進切換機構、５２ 変速機ケース、５２ａ 油路、５６ 油圧ポンプ、６０ 自動変速機油（ＡＴＦ）、６２ ＥＣＵ、６４ 油温センサ、６６ 回転数センサ
10 automatic transmission, 12 input shaft (rotary shaft), 14 DR pulley shaft (rotary shaft), 14a oil passage, 16 DN pulley shaft (rotary shaft), 16a oil passage, 20 torque converter, 26 CVT mechanism, 30 DR pulley 30b1 piston chamber (hydraulic working chamber), 32 DN pulley, 32b1 piston chamber (hydraulic working chamber), 36 forward / reverse switching mechanism, 52 transmission case, 52a oil passage, 56 hydraulic pump, 60 automatic transmission oil (ATF), 62 ECU, 64 Oil temperature sensor, 66 Speed sensor

Claims (3)

車両に搭載されて駆動源の回転を変速して駆動輪に伝達すると共に、変速機ケース内に回転自在に支持される自動変速機の作動・潤滑用の自動変速機油の劣化判定装置において、前記自動変速機油の油温を検出する油温検出手段と、前記油温検出手段によって検出された油温の上昇率を算出する油温上昇率算出手段と、前記車両の走行状態に基づいて前記自動変速機油の消泡性能の低下を推定させる閾値を算出する閾値算出手段と、所定の条件が成立したと判断されるとき、前記算出された油温上昇率を閾値と比較し、前記算出された油温上昇率が閾値以上のとき、前記自動変速機油が劣化したと判定する劣化判定手段と、前記劣化判定手段によって前記自動変速機油が劣化したと判定されるとき、ユーザに前記自動変速機油の交換を促す交換督促手段とを備えたことを特徴とする自動変速機油の劣化判定装置。   In an automatic transmission oil deterioration determination device mounted on a vehicle for transmitting and transmitting rotation of a drive source to a drive wheel and operating and lubricating an automatic transmission rotatably supported in a transmission case. An oil temperature detecting means for detecting an oil temperature of the automatic transmission oil, an oil temperature increase rate calculating means for calculating an increase rate of the oil temperature detected by the oil temperature detecting means, and the automatic operation based on the running state of the vehicle. Threshold calculating means for calculating a threshold for estimating a reduction in defoaming performance of transmission oil, and when it is determined that a predetermined condition is satisfied, the calculated oil temperature increase rate is compared with a threshold, and the calculated When the rate of increase in oil temperature is equal to or greater than a threshold value, a deterioration determining means for determining that the automatic transmission oil has deteriorated, and when the deterioration determining means determines that the automatic transmission oil has deteriorated, Exchange to encourage exchange Deterioration determination device for an automatic transmission oil, characterized in that a dunning means. 前記劣化判定手段は、前記検出された自動変速機油の油温が所定温度以上で、かつ前記自動変速機の回転要素の回転数が閾値以上の状態が既定時間以上継続したとき、前記所定の条件が成立したと判断することを特徴とする請求項１記載の自動変速機油の劣化判定装置。   The deterioration determining means is configured to detect the predetermined condition when the detected oil temperature of the automatic transmission oil is equal to or higher than a predetermined temperature and the rotational speed of the rotation element of the automatic transmission is equal to or higher than a threshold value for a predetermined time or longer. 2. The automatic transmission oil deterioration determination device according to claim 1, wherein the determination is made as follows. 前記閾値算出手段は、前記車両の走行速度と変速比とに基づいて前記閾値を算出することを特徴とする請求項１または２記載の自動変速機油の劣化判定装置。
3. The automatic transmission oil deterioration determination device according to claim 1, wherein the threshold value calculation means calculates the threshold value based on a traveling speed and a gear ratio of the vehicle.
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